钒的高压声速测量  

Sound velocities of vanadium under shock compression

作　　者：俞宇颖[1] 谭叶[1] 戴诚达[1] 李雪梅[1] 李英华[1] 谭华[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,冲击波物理与爆轰物理重点实验室,绵阳621900

出　　处：《物理学报》2014年第2期240-243,共4页Acta Physica Sinica

基　　金：国防基础科研计划项目(批准号:B1520110001);国家自然科学基金(批准号:11172281;11272293);中国工程物理研究院双百人才基金(批准号:ZX01115)资助的课题~~

摘　　要：采用反向碰撞方法进行了钒冲击实验,利用激光干涉测速技术对V/LiF窗口界面粒子速度剖面进行测量.通过对粒子速度剖面的分析获得了32—88 GPa压力范围内钒的高压声速.实验获得的声速-冲击压力关系在约60 GPa存在间断,表明钒发生了冲击相变.相变压力与静高压实验结果及第一性原理计算结果基本一致.A series of reverse-impact experiments is performed on vanadium at peak shock pressures from 32 GPa to 88 GPa. A displacement interferometer is used to measure the particle velocity profile at the vanadium/LiF window interface. Analysis of these profile provides a measure of sound velocity of vanadium in the Hugoniot state. The transition from body-centered cubic structure to rhombohedral structure phase at ~ 60 GPa is identified by the discontinuity of the sound velocity against shock pressure. This transition pressure is consistent with the data from high pressure diamond anvil cell experiments and first-principle calculations.

关 键 词：声速 相变 冲击加载 钒 

分 类 号：O572.2[理学—粒子物理与原子核物理]